Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
  • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
  • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
  • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
  • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
  • C08L1/08—Cellulose derivatives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
  • G02B1/14—Protective coatings, e.g. hard coatings
• • G—PHYSICS
  • G02—OPTICS
  • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
  • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
  • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
  • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
  • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
  • G02F1/1333—Constructional arrangements; Manufacturing methods
  • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
  • G02F1/133528—Polarisers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
  • C08J2301/08—Cellulose derivatives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
  • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment

Definitions

• the present invention relates to a method for manufacturing a polarizing plate, a polarizing plate, and an image display device using the same. More specifically, the present invention relates to a method for producing a polarizing plate having excellent productivity which eliminates problems such as peeling, curling, cracking, and blocking, and excellent polarizing properties and durability obtained by such a method. The present invention relates to a polarizing plate having the same and an image display device using such a polarizing plate.
• a polarizing plate used in an image display device has a process of forming a polarizer and a protective layer comprising the polarizer and a transparent protective film such as a triacetyl cellulose (TAC) film. And a step of bonding together.
• the step of forming a polarizer includes, for example, a dyeing step of dyeing a polybutyl alcohol (PVA) film with dichroic iodine or a dichroic dye, and a cross-linking step of cross-linking with boric acid or borax. And a stretching step of uniaxially stretching and a drying step of drying the stretched film.
• PVA polybutyl alcohol
• the dyeing, cross-linking, and stretching steps do not necessarily have to be performed separately, and may be performed in several steps at the same time, and the order of the steps is not particularly strictly defined.
• Generally manufactured polarizing plates have a TAC film bonded to both sides of the polarizer using an adhesive, so even if the polarizer and two protective films are bonded together, the appearance and curl will not be affected. It can be manufactured without causing a problem in the characteristics such as.
• TAC films have insufficient heat and humidity properties
• a polarizing plate using a TAC film as a protective film is used at a high temperature or high humidity, the polarization degree and the hue of the polarizing plate may be reduced. There is a disadvantage that performance is reduced.
• a transparent film having a low moisture permeability for example, a cyclic olefin resin
• a protective film having a low moisture permeability for example, a cyclic olefin resin
• a protective film having a low moisture permeability it is usually necessary to facilitate drying of the adhesive used for bonding the polarizer and the protective film.
• a protective film having a low moisture permeability is attached to one surface of the polarizer, and a protective film having a relatively high moisture permeability is attached to the other surface to manufacture a polarizing plate.
• Patent Document 1 Japanese Patent Application Laid-Open No. 2001-235625
• Patent Document 2 Japanese Patent Application Laid-Open No. 2002-196132
• the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a polarized light having excellent productivity without problems such as peeling, curling, cracking, and blocking.
• An object of the present invention is to provide a method for manufacturing a plate.
• Another object of the present invention is to provide a polarizing plate having excellent polarizing characteristics and durability obtained by such a manufacturing method.
• Still another object of the present invention is to provide an optical film in which at least one optical layer is laminated on such a polarizing plate, and an image display device using the polarizing plate and Z or the optical film. It is in.
• the method for producing a polarizing plate of the present invention comprises the steps of: adhering a first transparent protective film having a moisture permeability of 200 gZm2Z24h or less to one surface of a polarizer to form a laminate; And bonding a second transparent protective film having a higher moisture permeability than the first transparent protective film to the other surface of the polarizer.
• the polarizer and the first transparent protective film are attached to each other in a state where tension is applied to the polarizer and the first transparent protective film.
• the laminate and the second transparent protective film are attached to each other in a state where tension is applied to the laminate and the second transparent protective film.
• the amount of curl of the laminate is 5 mm or less. In another embodiment, the curling amount of the obtained polarizing plate is preferably 5 mm or less.
• the first transparent protective film is made of an amorphous polyolefin resin.
• the second transparent protective film is made of triacetyl cellulose.
• the manufacturing method further includes a step of drying the laminate before bonding the second transparent protective film.
• a polarizing plate is provided. This polarizing plate is obtained by the above manufacturing method.
• an optical element is provided. This optical element is obtained by laminating at least one optical layer on the polarizing plate.
• an image display device has the polarizing plate and the Z or the optical element.
• Examples of such an image display device include a liquid crystal display device, an electroluminescent (EL) display device, a plasma display (PD), and a field emission display (FED).
• EL electroluminescent
• PD plasma display
• FED field emission display
• the laminate is not wound up and is relatively transparent to the laminate.
• a transparent protective film having high humidity to produce a polarizing plate
• Peeling and curling at the time of setting are prevented.
• a polarizing plate having excellent durability and polarization characteristics can be obtained with excellent productivity.
• problems such as cracking and blocking due to temporary winding of the laminate do not occur. That is, according to the present invention, the problem caused by bonding transparent protective films having different properties (for example, elastic modulus) and thicknesses on both sides of the polarizer is reduced by reducing the thickness of the transparent protective film.
• FIG. 1 is a schematic diagram illustrating a method for manufacturing a polarizing plate according to a preferred embodiment of the present invention.
• FIG. 2 is a schematic cross-sectional view of a liquid crystal display device according to a preferred embodiment of the present invention.
• FIG. 3 is a schematic cross-sectional view illustrating an alignment state of liquid crystal molecules in a liquid crystal layer when a liquid crystal display device of the present invention employs a VA mode liquid crystal cell.
• FIG. 4 is a schematic sectional view of an organic EL display device according to a preferred embodiment of the present invention. Explanation of symbols
• a polarizing plate includes a polarizer, a first transparent protective film provided on one surface of the polarizer, and a second transparent protective film provided on the other surface of the polarizer. And a transparent protective film.
• any appropriate polarizer can be adopted depending on the purpose.
• a dichroic substance such as iodine or a dichroic dye is used for a hydrophilic polymer film such as a polybutyl alcohol-based film, a partially formalized polybutyl alcohol-based film, and an ethylene / butyl acetate copolymer-based partially modified film.
• a hydrophilic polymer film such as a polybutyl alcohol-based film, a partially formalized polybutyl alcohol-based film, and an ethylene / butyl acetate copolymer-based partially modified film.
• examples thereof include a uniaxially stretched film obtained by adsorption, a polyene-based oriented film such as a dehydrated product of polyvinyl alcohol and a dehydrochlorinated product of polyvinyl chloride.
• a polarizer obtained by adsorbing a dichroic substance such as iodine onto a polybutyl alcohol-based film and uniaxially stretching is particularly preferable because of its high polarization dichroic ratio.
• the polarizer may contain boric acid, zinc sulfate, zinc chloride, or the like as necessary.
• the thickness of the polarizer is not particularly limited, but is generally about 5 to 80 / zm.
• the first transparent protective film, the moisture permeability is 200gZm 2 Z24h less, preferably 0- 1 00g / m 2 / 24h .
• the moisture permeability is a value measured at 40 ° C and 92% RH in accordance with JIS Z 0280.
• a typical material for forming a film having such moisture permeability is an amorphous polyolefin resin.
• the amorphous polyolefin resin include a resin having a polymerization unit of a cyclic olefin such as a norbornene / polycyclic norbornene monomer, and a resin having a copolymer power of a cyclic olefin and a chain olefin. No.
• the first transparent protective film comprises a thermoplastic resin having a substituted and Z or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted and Z or unsubstituted fluoro group in a side chain.
• the resin composition containing the resin may also be a formed film.
• the resin composition may have an olefin component.
• Specific examples include a polymer film of a resin composition containing a dartalimide copolymer composed of N-methyldaltalimide and methyl methacrylate and an acrylonitrile-styrene copolymer, and isobutylene and N-methylmaleimide.
• a polymer film of a resin composition containing an alternating copolymer and an acrylonitrile-styrene copolymer is exemplified.
• the surface of the first transparent protective film to be bonded to the polarizer may be subjected to a treatment for improving the bonding force, if necessary.
• Typical examples of such treatment include dry treatment and easy adhesion treatment.
• Specific examples of the dry treatment include corona treatment, gas corona treatment, plasma treatment, and low-pressure UV treatment.
• Specific examples of the easy-adhesion treatment include application of an easy-adhesion treatment material.
• the material for easy adhesion treatment include cellulose resin, urethane resin, silane coupling agent, silicon primer, PVA, nylon, and styrene resin. Dry treatment and easy adhesion treatment can be used in combination.
• the adhesive strength can be improved by performing a Kani-dani treatment with an aqueous sodium hydroxide solution.
• the saponification treatment can be used together with the easy adhesion treatment.
• the first transparent protective film can also function as a retardation film.
• the first transparent protective film may be stretched. Stretching conditions (eg, stretching ratio, stretching direction, stretching temperature) can be appropriately set according to the purpose and desired retardation.
• any appropriate transparent film can be adopted as long as it has a higher moisture permeability than the first transparent protective film.
• the first transparent protective film two films having different moisture permeability are selected, and those having lower moisture permeability are used as the first transparent protective film, and those having higher moisture permeability are selected. May be used as the second transparent protective film.
• a transparent film other than those listed as the first transparent protective film may be used as the second transparent protective film.
• Examples of the transparent film other than those listed as the first transparent protective film include a cellulose resin film.
• a cellulose acetate resin film such as a triacetyl cellulose film and a diacetyl cellulose film is exemplified.
• a triacetyl cellulose film which is preferably a triacetyl cellulose and is preferably a triacetyl cellulose, is more preferred.
• the second transparent protective film, the moisture permeability preferably 200- 1000gZm 2 Z2 4h, more preferably from 300- 900Zm 2 Z24h.
• the thicknesses of the first transparent protective film and the second transparent protective film are not particularly limited.
• the thicknesses of the first transparent protective film and the second transparent protective film are each independently typically 500 m or less, preferably 1 to 300 ⁇ m, more preferably 5 to 300 ⁇ m. — 200 ⁇ m, most preferably 5-100 ⁇ m.
• the use of a thick protective film and a transparent protective film makes it possible to produce a polarizing plate having extremely excellent durability (for example, heat resistance and moisture resistance).
• the thickness can be reduced to about 1 m, which is sufficient.
• both the first transparent protective film and the second transparent protective film have as little coloring as possible.
• the retardations Rth in the thickness direction of the first transparent protective film and the second transparent protective film are each independently preferably -90 nm- + 75 nm, more preferably -80- + 60 nm. , Most preferably -70 ⁇ m-+45 nm.
• coloring optical coloring
• nx and ny are the main refractive indices in the film plane
• nz is the refractive index in the film thickness direction
• d is the film thickness.
• polarization A method for manufacturing a child will be described.
• a method for producing a polarizer which is uniaxially stretched by adsorbing a dichroic substance such as iodine on a polybutyl alcohol-based film will be described.
• Such a polarizer is manufactured by a manufacturing method including, for example, a swelling step, a dyeing step, a crosslinking step, and a stretching step.
• the swelling step the polyvinyl alcohol-based film is immersed in water to swell the film.
• the polybutyl alcohol-based film By immersing in water and washing, dirt and anti-blocking agent on the surface of the polyvinyl alcohol-based film can be washed. Furthermore, swelling of the polybutyl alcohol-based film has an effect of preventing unevenness such as uneven dyeing.
• the dyeing step the polybutyl alcohol-based film is dyed in a bath containing a dichroic substance such as iodine or a dye such as a dichroic dye.
• the crosslinking step the polyvinyl alcohol-based film is crosslinked in a bath containing a crosslinking agent such as boric acid or borax.
• the stretching step the polybutyl alcohol-based film is stretched 3 to 7 times the original length.
• stretching may be performed after dyeing with iodine, or stretching may be performed while dyeing, and may be stretched and dyed with iodine. Stretching can be performed in an aqueous solution of boric acid or potassium iodide or in a water bath.
• the polarizer and the transparent protective film are bonded together.
• the first transparent protective film and the second transparent protective film are separately bonded to one side of the polarizer. Since the first transparent protective film and the second transparent protective film have different properties (for example, elastic modulus and moisture permeability), when three polarizers and two protective films are simultaneously bonded, curling occurs. And force that may cause peeling.
• a first transparent protective film 32 is attached to one surface of the polarizer 31 to form a laminate 35, and then the laminate 35 is formed.
• the second transparent protective film 33 that is not wound up is attached to the other surface of the polarizer 31 to obtain the polarizing plate 30.
• the laminating step of the laminate and the second transparent protective film may be performed continuously as a laminating step of the polarizer and the first transparent protective film. It may be performed after other operations (for example, a drying process and a process for improving the adhesive strength) are performed on the formed laminate 35.
• a drying process and a process for improving the adhesive strength are performed on the formed laminate 35.
• the second protective film is continuously bonded, a polarizing plate can be obtained with extremely excellent productivity.
• a polarizing plate having more excellent characteristics can be obtained depending on the purpose.
• the step of laminating the laminate and the second transparent protective film is performed after the laminate has been subjected to a drying treatment.
• drying temperature 40-90 ° C and the drying time is 110 minutes.
• the order of bonding the transparent protective films is as follows: first, the first transparent protective film (a film having a relatively low moisture permeability) is bonded to the polarizer, and then the second transparent protective film is formed. However, it is preferable to attach films). By laminating in such an order, if the drying treatment is performed at an appropriate time as described above, the excess water can be removed extremely well. As a result, a polarizing plate having very excellent polarization characteristics and display characteristics can be obtained.
• the bonding between the polarizer and the first transparent protective film and the bonding between the laminated body and the second transparent protective film become flat after the bonding. It is performed while performing such processing.
• whether or not the state after bonding is flat is determined based on the curl amount.
• the ⁇ curl amount '' refers to a sample obtained by punching a laminate or a polarizing plate obtained by lamination into a size of 100 mm x 100 mm in a direction of 45 ° with respect to the absorption axis of the polarizer. When the sample is placed on a flat surface, the flat surface force is also lifted.
• the curl amount of the laminate or the polarizing plate is preferably as small as possible, since the state after lamination is flat. Specifically, the curl amount is preferably 5 mm or less, more preferably 3 mm or less. Below.
• a polarizer and a first transparent protective film are applied while tension is applied to the polarizer and the first transparent protective film.
• tension is applied to the bonding of the laminate and the second transparent protective film.
• tension for example, there is a method of utilizing a peripheral speed difference of a guide roll for conveying a polarizer and a transparent protective film. More specifically, for example, when laminating the polarizer and the first transparent protective film, the rotation speed of the roll 36 on the winding side in FIG. 1 should be faster than the rotation speed of the roll 37 on the sending side. Just fine.
• the rotation speed of the roll can be set appropriately according to the purpose and the desired tension.
• the bonding of the polarizer and the first or second transparent protective film is typically performed using an adhesive.
• an adhesive any suitable adhesive having good adhesiveness to the polarizer and the transparent protective film can be employed.
• the polarizer is a polyvinyl alcohol (PVA) -based film
• PVA polyvinyl alcohol
• Any appropriate PVA-based resin can be adopted as the PVA-based resin.
• Representative examples include unsubstituted PVA and PVA having a reactive high-functionality group. Highly reactive PVA having a functional group is particularly preferred. This is because the durability of the obtained polarizing plate can be further remarkably improved.
• the PVA having a highly reactive functional group include PVA resin modified with an acetoacetyl group.
• the polymerization degree of the binder resin (for example, PVA resin) of the adhesive is preferably 100 to 3000. By having a polymerization degree in such a range, the adhesion to the polarizer and the transparent protective film can be particularly improved.
• the thickness of the adhesive layer can be appropriately set according to the purpose and use of the image display device using the polarizing plate, but is preferably 30 to 300 nm, more preferably 50 to 150 nm.
• the adhesive layer is formed by applying and drying an aqueous adhesive solution.
• the adhesive may further contain a crosslinking agent.
• the crosslinking agent is preferably a water-soluble crosslinking agent.
• Specific examples of the water-soluble crosslinking agent include boric acid, borax, daltaraldehyde, melamine, oxalic acid and the like.
• the adhesive may be used with any suitable additives (for example, it may further include an antioxidant, an ultraviolet absorber) and Z or a catalyst (eg, an acid).
• an optical element is provided.
• This optical element is obtained by laminating an optical layer on the polarizing plate.
• the optical layer any appropriate optical layer can be adopted depending on the purpose. More specifically, examples of the optical layer include various optical films capable of improving the display accuracy and the Z or visibility of the image display device. Specific examples of such an optical layer include an alignment liquid crystal layer, a reflection plate, a semi-transmission plate, a retardation plate (for example, ⁇ plate, ⁇ / 4 plate), a viewing angle compensation film, a brightness enhancement film, and the like.
• an optical element in which a polarizing plate and an optical layer are combined include a reflective polarizing plate (a combination of a polarizing plate and a reflecting plate) and a transflective polarizing plate (a polarizing plate and a transflective plate).
• Polarizer with retarder combination of polarizer and retarder
• elliptically or circularly polarizer combination of polarizer and ⁇ 4 plate
• wide viewing angle polarizer polarizer and viewing angle
• a polarizing plate with a brightness enhancement film (combination of a polarizing plate and a brightness enhancement film).
• the “optical layer” includes a surface-treated portion (surface-treated layer) applied to a surface of the above-mentioned transparent protective film on which a polarizer is bonded.
• a surface treatment include a hard coat treatment, an anti-reflection treatment, an anti-sticking treatment, a diffusion or an anti-glare treatment.
• the optical layer may be a single layer or two or more layers. When there are two or more optical layers, each layer may be the same, or the above-mentioned various optical layers may be appropriately combined. Typically, by combining optical layers having different characteristics, an image display device having more excellent display accuracy and higher visibility or visibility can be obtained.
• the lamination position (substantially the lamination order) of the optical layers can be appropriately set according to the purpose.
• the optical layer may be bonded to a transparent protective film which may be bonded to a polarizer before bonding the polarizer and the transparent protective film. Further, for example, after laminating the polarizer and the transparent protective film, the polarizer may be laminated to the obtained laminate or polarizing plate.
• the polarizer, the transparent protective film, and the optical layer may be bonded together.
• polarizers and optical layers aim at their optical axes (eg, the absorption axis of the polarizer, the slow axis of the optical layer).
• the layers can be stacked so as to define an appropriate angle accordingly.
• any appropriate pressure-sensitive adhesive can be used for lamination (lamination) of the polarizing plate and the optical layer.
• the hard coat treatment is performed for the purpose of preventing the polarizing plate surface from being damaged.
• the hard coat treatment is performed, for example, by forming a cured film having excellent hardness and slipperiness.
• the cured film is typically formed using an ultraviolet curable resin (for example, acrylic resin or silicone resin).
• the antireflection treatment is performed for the purpose of preventing reflection of external light on the surface of the polarizing plate.
• the antireflection treatment is performed by forming any appropriate antireflection film.
• the above-mentioned stateing prevention treatment is performed for the purpose of preventing adhesion to an adjacent layer.
• the anti-glare treatment is performed for the purpose of preventing external light from being reflected on the polarizing plate surface and hindering visual recognition of light transmitted through the polarizing plate.
• the anti-glare treatment is typically performed by giving a fine uneven structure to the surface of the transparent protective film.
• Specific examples of the means for providing a fine uneven structure include roughening by sandblasting or embossing, and forming unevenness by transparent fine particles.
• the formation of the irregularities by the transparent fine particles is performed by applying a composition containing the transparent resin and the transparent fine particles to the surface of the transparent protective film and drying.
• the transparent fine particles used for forming the unevenness include inorganic fine particles that can be conductive, such as silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide, and crosslinked or uncrosslinked polymers.
• Organic fine particles are exemplified.
• the average particle size of the transparent fine particles is preferably 0.5 to 50 m.
• the amount of the transparent fine particles to be used is preferably about 2 to 70 parts by weight, more preferably 5 to 50 parts by weight, based on 100 parts by weight of the transparent resin.
• the anti-glare layer formed by the anti-glare treatment may also serve as a diffusion layer that diffuses light transmitted through the polarizing plate to increase a viewing angle or the like (that is, has a viewing angle expanding function).
• the surface treatment layer as described above may be formed on the transparent protective film itself by performing a surface treatment on the transparent protective film, and a separate and independent film may be laminated on the transparent protective film surface.
• C-2 Reflective polarizing plate
• the reflection type polarizing plate is constituted by providing a reflecting plate (reflection layer) made of metal or the like on one side of the polarizing plate.
• a transparent protective layer or the like is provided between the polarizing plate and the reflective film as needed.
• the transparent protective layer is subjected to a mat treatment or the like as necessary.
• the reflection type polarizing plate is suitably used for a reflection type liquid crystal display device (a liquid crystal display device that reflects and displays an incident light from a viewing side (display side)).
• a reflective polarizing plate it is not necessary to incorporate a light source such as a backlight in the liquid crystal display device, and therefore, advantages such as easy reduction in thickness of the liquid crystal display device can be obtained.
• the material forming the reflective layer include a reflective metal such as aluminum.
• the reflective layer may be formed by attaching such a reflective metal foil to a transparent protective film and then by vapor deposition.
• the reflective layer may have a fine uneven structure on the surface.
• Such a reflective layer is obtained, for example, by incorporating fine particles into a transparent protective film at the time of forming the protective film, forming a fine uneven structure on the surface thereof, and forming a reflective metal layer thereon.
• a reflective layer is formed reflecting the fine uneven structure on the surface of the transparent protective film.
• the fine particle-containing transparent protective film itself also has a function of diffusing incident light and its reflected light when passing through it, so that bright and dark glare can be further suppressed.
• the reflective layer reflecting the surface fine unevenness structure of the transparent protective film is formed by, for example, an evaporation method such as vacuum evaporation, ion plating, or sputtering, or a plating method.
• a reflection plate in which the reflection layer is provided on an appropriate base film can be used instead of forming the reflection layer directly on the surface of the transparent protective film. Since the reflective layer is usually made of a metal, it is preferable to use the reflective layer with its reflective surface covered with a transparent protective film or a polarizing plate. This is because the reflectance is prevented from lowering due to oxidation, so that the initial reflectance can be maintained for a long period of time, and there is no need to separately form a protective layer.
• the transflective polarizing plate is configured by providing a transflective reflecting plate (reflection layer) on one side of the polarizing plate.
• the semi-transmissive reflective layer is typically a half mirror that reflects and transmits light. .
• the transflective polarizing plate is applied to a transflective liquid crystal display device.
• a transflective polarizing plate is usually provided on the back side of a liquid crystal cell.
• a transflective liquid crystal display device reflects an incident light from the viewing side (display side) to display an image when used in a relatively bright environment, and a backlight when used in a relatively dark environment. An image is displayed using a built-in light source such as a light source.
• transflective polarizing plate it is possible to save energy in the use of a light source such as a backlight in a bright environment, thereby realizing power saving.
• a light source such as a backlight
• the light of the light source power is used, so that the display can be performed. The advantages are easy to see.
• the polarizing plate with a phase difference plate is obtained by laminating a phase difference plate on a polarizing plate.
• a retardation plate a retardation plate having any appropriate optical characteristics according to the purpose can be adopted.
• a ⁇ 2 plate is used as a retardation plate.
• a ⁇ ⁇ 4 plate is used as a retardation plate (such a polarization plate with a retardation plate).
• the plate is referred to as an elliptically polarizing plate or a circularly polarizing plate).
• An elliptically polarizing plate compensates (prevents) coloring (blue or yellow) caused by the birefringence of the liquid crystal layer of a super twisted nematic (STN) type liquid crystal display device to achieve a colorless black and white display.
• STN super twisted nematic
• an elliptically polarizing plate whose refractive index is controlled three-dimensionally is particularly preferable because coloring which occurs when a screen of a liquid crystal display device is viewed from an oblique direction can be compensated (prevented).
• the ⁇ 4 plate may be combined with a reflective polarizer to form a reflective elliptical polarizer.
• the circularly polarizing plate is effectively used, for example, when adjusting the color tone of an image of a reflection type liquid crystal display device for displaying an image in color, and also has an antireflection function.
• retardation plates with a refractive index distribution that compensates for coloring and viewing angle characteristics due to the birefringence of the liquid crystal layer of the liquid crystal display device, and are compatible with various wavelengths
• a retardation plate having a phase difference is used.
• the retardation plate can be used alone or in combination of two or more having different characteristics.
• the retardation plate As the retardation plate, a birefringent film obtained by uniaxially or biaxially stretching a polymer material, an alignment film of a liquid crystal polymer, and an alignment layer of a liquid crystal polymer are supported by the film. And the like.
• the stretching treatment can be performed by, for example, a roll stretching method, a long gap stretching method, a tenter stretching method, a tubular stretching method, or the like.
• the stretching ratio is generally about 1.1 to 13 times.
• the thickness of the retardation plate is not particularly limited, it is generally 10 to 200 ⁇ m, preferably 20 to 100 ⁇ m.
• Examples of the above polymer material include polyvinyl alcohol, polyvinyl butyral, polymethyl vinyl ether, polyhydroxyethyl acrylate, hydroxyethyl cellulose, hydroxypropylcellulose, methinoresenorelose, polycarbonate, and polyaryle.
• Polysulfone polyethylene terephthalate, polyethylene naphthalate, polyethylene ether sulfone, polyphenylene sulfide, polyphenylene oxide, polyallyl sulfone, polyvinyl alcohol, polyamide, polyimide, polyolefin, polyvinyl chloride, cellulose polymer, Alternatively, there may be mentioned various binary and ternary copolymers, graft copolymers and blends thereof.
• a birefringence is imparted to a film formed from such a polymer material by performing a stretching treatment or the like.
• liquid crystal polymer for example, a main chain type liquid crystal polymer in which a conjugated rigid atomic group (mesogen) capable of expressing liquid crystallinity is introduced into the main chain of the polymer, and a mesogen is introduced into a side chain.
• Side chain type liquid crystal polymers can be used.
• the main-chain type liquid crystal polymer has a structure in which a mesogen group is bonded via a spacer that imparts flexibility.
• the main chain type liquid crystal polymer include, for example, a polyesterol-based liquid crystal polymer having a nematic alignment property, a discotic polymer, and a cholesteric polymer.
• the side-chain liquid crystal polymer include polysiloxane, polyatalylate, polymethacrylate or polymalonate as a main chain skeleton, and nematic alignment through a spacer portion composed of a conjugated atomic group as a side chain.
• a polymer having a mesogenic moiety that provides a unitary force of the para-substituted cyclic conjugated substance having imparting property is exemplified.
• a liquid crystal polymer alignment film is formed by applying a solution containing these liquid crystal polymers on an alignment-treated substrate, heat-treating the liquid crystal polymer at a temperature at which the liquid crystal phase develops, and fixing the liquid crystal phase. It is formed.
• the substrate subjected to the orientation treatment include those obtained by rubbing the surface of a thin film of polyimide or polyvinyl alcohol formed on a glass plate, those obtained by obliquely depositing silicon oxide, and the like.
• the polarizing plate with a retardation plate can also be formed by sequentially laminating a polarizing plate and a retardation plate in a manufacturing process of a liquid crystal display device. It is preferable to use it as a polarizing plate with a retardation plate. The reason for this is that since the quality is stable and the layering workability is excellent, the manufacturing efficiency of a liquid crystal display device or the like can be improved.
• a viewing angle compensation film used for a wide viewing angle polarizing plate is used to widen the viewing angle so that an image can be clearly seen even when the screen of an image display device (typically, a liquid crystal display device) is viewed from an oblique direction.
• Film examples include a retardation plate, an alignment film such as a liquid crystal polymer, and a film in which an alignment layer such as a liquid crystal polymer is supported on a transparent substrate.
• a retardation plate used as a viewing angle compensating film is a polymer film having birefringence biaxially stretched in a plane direction and a birefringent polymer film stretched uniaxially in a plane direction and also stretched in a thickness direction.
• Examples include polymer films with controlled birefringence, or bidirectionally stretched films such as obliquely oriented films.
• Examples of the obliquely oriented film include, for example, a film obtained by bonding a heat shrinkable film to a polymer film and subjecting the polymer film to a stretching treatment and a Z or shrinkage treatment under the action of the shrinkage force caused by heating, or a film obtained by obliquely aligning a liquid crystal polymer. And the like.
• the polymer material constituting the retardation film used as the viewing angle compensation film it is possible to prevent coloring and the like due to a change in the viewing angle due to the birefringence of the liquid crystal cell (liquid crystal layer), and obtain good visibility.
• any suitable polymeric material that increases the viewing angle can be used.
• a polymer material similar to that described for the ordinary retardation plate is used.
• a viewing angle compensation film in which an alignment layer such as a liquid crystal polymer is supported on a transparent substrate a viewing angle compensation film in which a tilted alignment layer of a discotic liquid crystal polymer is supported on a triacetyl cellulose film substrate is exemplified.
• Such a viewing angle compensation film can significantly widen the viewing angle at which good visibility can be obtained.
• the polarizing plate with a brightness enhancement film is usually used by being provided on the back side of a liquid crystal cell.
• the brightness enhancement film reflects linearly polarized light having a predetermined polarization direction or circularly polarized light having a predetermined rotation direction, and transmits other light. According to Thus, when light having a light source power such as a knock light enters the polarizing plate with a brightness enhancement film, only polarized light having a predetermined polarization state is transmitted from the incident light, and other light is reflected.
• This reflected light is inverted through a reflection layer or the like provided on the back side of the brightness enhancement film and re-enters the brightness enhancement film, and a part or all of the reflected light is transmitted as polarized light having a predetermined polarization state. Accordingly, it is possible to increase the amount of light that passes through the brightness enhancement film and to supply polarized light that is hardly absorbed by the polarizer, thereby increasing the amount of light that can be used for liquid crystal image display and the like. As a result, the brightness of the liquid crystal display device can be improved.
• a brightness enhancement film when light from a light source is incident on the back side of a liquid crystal cell through a polarizer, substantially all light having a polarization direction that is not coincident with the polarization axis of the polarizer is obtained. It is absorbed by the polarizer and does not pass through the polarizer. As a result, since about 50% of the light from the light source is absorbed by the polarizer, the amount of light that can be used for liquid crystal image display and the like decreases, and the image becomes darker.
• the brightness enhancement film reflects light having a polarization direction that can be absorbed by the polarizer, without being incident on the polarizer, and reflects the light on the brightness enhancement film, and further includes a reflection layer provided on the back side.
• the polarization direction of the light reflected and inverted between the brightness enhancement film and the reflective layer can pass through the polarizer by repeating the reversal and re-injection into the brightness enhancement film through the polarizer. Since only the polarized light is transmitted and supplied to the polarizer, light from the light source can be efficiently used for displaying an image on the liquid crystal display device, and the screen can be brightened.
• a diffusion plate may be provided between the brightness enhancement film and the reflective layer. As described above, the polarized light reflected by the brightness enhancement film travels to the reflective layer. By providing a diffusion plate in the path of the light, the light passing through the path is diffused uniformly, and at the same time, the polarization state is eliminated and the state returns to the non-polarized state (that is, the original natural light state). The light in the non-polarized state (natural light state) is inverted through the reflection layer or the like, passes through the diffuser again, and re-enters the brightness enhancement film. As a result, while maintaining the brightness of the display screen
• the brightness enhancement film include a film exhibiting a property of transmitting only linearly polarized light having a predetermined polarization direction and reflecting other light (for example, a multilayer thin film of a dielectric, a refractive index anisotropy).
• a multi-layered laminate of thin films with different properties one that reflects left-handed or right-handed circularly polarized light and transmits the other (for example, cholesteric liquid crystal polymer alignment film, cholesteric alignment liquid crystal layer). Is supported on a film substrate).
• the transmitted light is polarized as it is by making the polarization direction of the transmitted light coincide with the polarization axis of the polarizing plate.
• a brightness enhancement film that transmits circularly polarized light having a predetermined rotation direction such as a cholesteric liquid crystal layer, it is preferable that the transmitted circularly polarized light be converted into linearly polarized light and incident on a force polarizing plate.
• a phase difference plate (typically, ⁇ ⁇ 4 plate) is used.
• a retardation plate may be a single-layer ⁇ 4 plate or a laminate including a ⁇ 4 plate.
• it shows a retardation layer that functions as a ⁇ 4 plate in a wide wavelength range (for example, the entire visible light range), a retardation layer that functions as a ⁇ 4 plate for monochromatic light with a wavelength of 550 nm, and other retardation characteristics.
• a retardation plate obtained by laminating a retardation layer (for example, a retardation layer functioning as a ⁇ 2 plate) is preferably used.
• the cholesteric liquid crystal layer by using two or more layers having different reflection wavelengths in combination, a brightness enhancement film that reflects circularly polarized light in a very wide wavelength range (for example, the entire visible light range) can be obtained.
• a brightness enhancement film By using such a brightness enhancement film, it is possible to obtain transmission circularly polarized light applicable to a wide wavelength range.
• the optical element of the present invention is a reflective elliptically polarizing plate combining a reflective polarizing plate (C2 above) and a retardation plate, or a transflective polarizing plate (C-3 above) and a retardation plate. And a transflective elliptically polarizing plate combining the above.
• the optical element of the present invention includes a polarizing plate and an optical layer which are sequentially formed when an image display device is manufactured. It may be used as an integrated optical element in which a polarizing plate and an optical layer are previously laminated. An integral type is preferred. It excels in quality stability and assembly work, and is capable of improving the manufacturing efficiency of image display devices.
• a pressure-sensitive adhesive layer for bonding to another member of the image display device may be formed practically.
• the pressure-sensitive adhesive layer preferably has a low moisture absorption rate and excellent heat resistance. The foaming and peeling phenomena due to moisture absorption are prevented, and the deterioration of the optical characteristics and the warpage of the liquid crystal cell due to the difference in thermal expansion and the like are prevented, so that it is possible to obtain an image display device having high quality and excellent durability.
• the pressure-sensitive adhesive layer can be formed from, for example, an acrylic pressure-sensitive adhesive. If necessary, the pressure-sensitive adhesive layer may contain fine particles and have a light diffusing property.
• the pressure-sensitive adhesive layer can be formed at any appropriate place depending on the purpose.
• an adhesive layer may be provided on one of the protective film surfaces, or an adhesive layer may be provided on both protective film surfaces.
• the pressure-sensitive adhesive layer When the pressure-sensitive adhesive layer is provided so as to be exposed on the surface of the polarizing plate or the optical element, the pressure-sensitive adhesive layer is temporarily attached with a separator in order to prevent the pressure-sensitive adhesive layer from being contaminated before practical use. It is preferable to cover.
• the separator is formed by providing a release coat on an appropriate thin film formed from the material used for the transparent protective film, if necessary.
• the release coat typically comprises a release agent layer of a silicone type, a long-chain alkyl type, a fluorine type, molybdenum sulfide or the like.
• Each layer (specifically, the polarizer, the transparent protective film, the optical layer, and the pressure-sensitive adhesive layer) constituting the polarizing plate and Z or the optical element of the present invention may have an ultraviolet absorbing ability as required. May be provided.
• the ultraviolet absorbing ability is provided, for example, by introducing an ultraviolet absorbing agent into the layer.
• the ultraviolet absorber include a salicylic acid ester compound, a benzophenone compound, a benzotriazole compound, a cyanoacrylate compound, and a nickel complex salt compound.
• FIG. 2 is a schematic sectional view of a liquid crystal display according to a preferred embodiment of the present invention.
• a transmission type liquid crystal display device will be described, but it goes without saying that the present invention is also applied to a reflection type liquid crystal display device and the like.
• the liquid crystal display device 100 includes a liquid crystal cell 10, retardation plates 20, 20 ′ disposed on both sides of the liquid crystal cell 10, and polarizing plates 30, 30 disposed outside the retardation plates 20, 20 ′. , A light guide plate 40, a light source 50, and a reflector 60.
• the polarizing plates 30, 30 ' are typically arranged such that the polarizing axes of the polarizers are orthogonal to each other.
• the polarizing plates 30, 30 ' are the above-described polarizing plates of the present invention.
• the polarizing plates 30 and 30 ' are the optical elements of the present invention (that is, a combination of the polarizing plate and various optical layers), the retardation plates 20 and 20' can be omitted.
• the liquid crystal cell 10 has a pair of substrates (glass substrate or plastic substrate) 11, 11 'and a liquid crystal layer 12 as a display medium disposed between the substrates.
• the substrate 11 is provided with a switching element (typically, a TFT) for controlling the electro-optical characteristics of the liquid crystal, and a scanning line for supplying a gate signal and a signal line for supplying a source signal to the switching element. (V, neither is shown).
• the other substrate 11 ' is provided with a color layer constituting a color filter and a light-shielding layer (black matrix layer) (both not shown). The distance (cell gap) between the substrates 11 and 11 ′ is controlled by the spacer 13.
• any appropriate display mode can be adopted as long as the effects of the present invention can be obtained.
• VA Vertical Alignment
• OCB Optically Compensated Birefringence
• TN twisted nematic
• STN super twisted nematic
• ECB horizontal alignment
• IPS in-plane switching
• SSFLC ferroelectric liquid crystal
• AF LC antiferroelectric liquid crystal
• FIG. 3 is a schematic cross-sectional view illustrating an alignment state of liquid crystal molecules in the VA mode.
• the liquid crystal molecules are oriented perpendicular to the substrates 11 and 11 '.
• Such vertical alignment can be realized by disposing a nematic liquid crystal having negative dielectric anisotropy between substrates on which a vertical alignment film (not shown) is formed.
• the linearly polarized light passing through the polarizing plate 30 and entering the liquid crystal layer 12 is directed in the direction of the long axis of the vertically aligned liquid crystal molecules.
• the incident light travels without changing the polarization direction,
• the light is absorbed by a polarizing plate 30 ′ having an absorption axis orthogonal to the light plate 30.
• a display in a dark state can be obtained when no voltage is applied (normally black mode).
• FIG. 3 (b) when a voltage is applied between the electrodes, the long axes of the liquid crystal molecules are oriented parallel to the substrate surface. In this state, the liquid crystal molecules exhibit birefringence with respect to the linearly polarized light incident on the liquid crystal layer 12, and the polarization state of the incident light changes in accordance with the tilt of the liquid crystal molecules.
• the light that passes through the liquid crystal layer when a predetermined maximum voltage is applied becomes, for example, linearly polarized light whose polarization direction is rotated by 90 °, so that the light passes through the polarizing plate 30 ′ and a bright display is obtained.
• the display can be returned to the dark state by the alignment regulating force. Further, by changing the applied voltage to control the tilt of the liquid crystal molecules and changing the intensity of the transmitted light from the polarizing plate 30 ', gradation display is possible.
• the present invention can be applied not only to a liquid crystal display device but also to a self-luminous display device such as an electorum luminescence (EL) display, a plasma display (PD), and a field emission display (FED).
• a self-luminous display device such as an electorum luminescence (EL) display, a plasma display (PD), and a field emission display (FED).
• EL electorum luminescence
• PD plasma display
• FED field emission display
• an organic electorum luminescence (EL) display device will be described as an example.
• FIG. 4 is a schematic sectional view of an organic electroluminescent (EL) display device according to a preferred embodiment of the present invention.
• the organic EL display device 600 includes a transparent substrate 610, a transparent electrode 620 formed sequentially on the transparent substrate 610, an organic light emitting layer 630 and a counter electrode 640, and an inorganic protective film 660 disposed so as to cover these.
• a resin protective film 670 When the transparent electrode 620 and the counter electrode 640 overlap, the transparent electrode 620, the organic light emitting layer 630, and the counter electrode 640 are S pixels 650 in the region.
• the transparent electrode 620 is formed of an ITO (Indium Tin Oxide) film, which is a transparent conductive film, and is used as an anode.
• the counter electrode 640 is formed of a metal film such as Mg-Ag or A1-Li, and is used as a cathode.
• the organic light emitting layer 630 is a laminate of various organic thin films.
• the organic light emitting layer 6 Reference numeral 30 denotes a hole-injecting organic material (for example, a triphenylamine derivative), a hole-injecting layer 631 provided to improve the hole-injecting efficiency from the anode, and a light-emitting organic material (for example, anthracene).
• It has a light emitting layer 632 which is also powerful and an electron injection layer 632 made of an electron injecting material (for example, a perylene derivative) and provided to improve the efficiency of electron injection from the cathode.
• the organic light emitting layer 630 is not limited to the illustrated example, and any appropriate combination of organic thin films that can cause light emission by recombination of electrons and holes in the light emitting layer 632 can be employed.
• the light-emitting layers of three adjacent pixels may be made of a light-emitting organic substance that emits red (R), green (G), and blue (B) light, respectively.
• a suitable color filter may be provided on the light emitting layer.
• the thickness of the organic light emitting layer 630 is preferably as thin as possible. This is because it is preferable to transmit emitted light as much as possible.
• the organic light emitting layer 630 can be formed of, for example, an extremely thin film having a thickness of about 10 nm.
• the polarizing plate has a function of polarizing light incident from the outside and reflected on the metal electrode, there is an effect that a mirror surface of the display surface is not visually recognized by an external force due to the polarizing function.
• ⁇ ⁇ 4 the angle between the slow axis of the phase difference plate and the absorption axis of the polarizing plate to ⁇ ⁇ 4
• the mirror surface can be shielded substantially completely.
• linearly polarized light is generally converted into elliptical polarized light by a retardation plate, but the entire retardation of the retardation plate is 1Z4 of the visible wavelength, and the slow axis of the retardation plate and the absorption axis of the polarizing plate are different from each other. If the angle formed is ⁇ 4, the light will be circularly polarized.
• This circularly polarized light passes through the transparent substrate 610, the transparent electrode 620, and the organic light emitting layer 630, is reflected by the counter electrode 640, passes through the organic light emitting layer 630, the transparent electrode 620, and the transparent substrate 610 again, and The light becomes linearly polarized light again.
• This linearly polarized light cannot pass through the polarizing plate because it is orthogonal to the polarizing direction of the polarizing plate. As a result, the mirror surface of the display surface can be substantially completely shielded.
• the polarizing plate was cut into 25 ⁇ 50 mm, and it was tested at room temperature whether the polarizer and the transparent protective film could be peeled off by hand.
• the polarizing plate was cut into 25 ⁇ 50 mm, immersed in warm water at 60 ° C., and the time until the protective film of the polarizing plate was peeled was measured.
• the two polarizing plates were bonded to a glass plate so that the absorption axes of the polarizers were orthogonal to each other, left in an oven at 90 ° C. for 120 hours, and light leakage was observed on a backlight.
• Norbornene-based film manufactured by Nippon Zeon Co., Ltd., trade name "ZEONOR", 40 m
• corona treated in the discharge amount of 200wminZm 2 on one side of was cast on the treated surface, and then heat-treated at 120 ° C for 30 minutes to obtain a moisture permeability of 0.6 gZm. 2
• a transparent protective film a of Z24h was obtained.
• This film was stretched 1.7 times at 160 ° C in the MD direction, and then stretched 1.8 times at 160 ° C in the TD direction.
• the thickness of the obtained biaxially stretched transparent film was 50 m.
• One surface of the transparent protective film was subjected to corona treatment with a discharge amount of 200 wminZm 2 .
• a silicone primer (trade name “APZ-6601”, 5 wt%, manufactured by Nippon Kayaku Co., Ltd.) was cast on the treated surface, and then heated at 120 ° C. for 30 minutes to obtain a moisture permeability of 87 g Zm 2 Z24h.
• Light protection film b was obtained.
• Polybutyl alcohol having a thickness of 75 ⁇ m and a degree of polymerization of 2400 was stretched 2.5 times while being immersed in pure water at 30 ° C for 1 minute. Then, it was stretched 1.2 times while immersing it in a dyeing bath containing iodine and potassium iodide at 30 ° C for 1 minute. Next, the film was stretched twice while being immersed in a 4% boric acid bath at 60 ° C for 2 minutes. Furthermore, the film was immersed in a 5% aqueous solution of potassium iodide at 30 ° C for 5 seconds, and dried at 35 ° C for 5 minutes to obtain a polarizer.
• a transparent protective film a was attached to one surface of the polarizer using a PVA-based adhesive to form a laminate.
• lamination was performed while controlling the tension so that the obtained laminate was flat.
• a PVA-based adhesive is used on the other surface of the polarizer.
• the transparent protective film c was adhered and dried at 60 ° C for 5 minutes and at 70 ° C for 5 minutes to obtain a polarizing plate.
• lamination was performed while controlling the tension so that the obtained polarizing plate force became S flat.
• the obtained polarizing plate was subjected to an adhesion test, a 60 ° C warm water immersion test, and a 90 ° C durability test. The results are shown in Table 1 below. [0078] [Table 1]
• a polarizing plate was produced in the same manner as in Example 1, except that the transparent protective film b was used instead of the transparent protective film a.
• the obtained polarizing plate was subjected to the same evaluation as in Example 1. Table 1 shows the results.
• a polarizer was prepared in the same manner as in Example 1, and a transparent protective film c was simultaneously adhered to both surfaces of the polarizer using a PVA-based adhesive, and dried at 60 ° C for 5 minutes and at 70 ° C for 5 minutes to polarize. I got a board. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.
• a polarizer was prepared in the same manner as in Example 1, and a transparent protective film a was simultaneously attached to both sides of the polarizer using a PVA-based adhesive. For 5 minutes to obtain a polarizing plate. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1. [0082] [Comparative Example 3]
• a polarizer was prepared in the same manner as in Example 1, and a transparent protective film a and a transparent protective film c were simultaneously stuck together using a PVA-based adhesive, and were then placed at 50 ° C for 5 minutes, at 60 ° C for 5 minutes, and at 70 °. C for 5 minutes to obtain a polarizing plate.
• the obtained polarizing plate was subjected to the same evaluation as in Example 1. Table 1 shows the results.
• a polarizer was obtained in the same manner as in Example 1.
• a transparent protective film c was attached to one surface of the polarizer using a PVA-based adhesive to form a laminate.
• lamination was performed while controlling the tension so that the obtained laminate was flat.
• the other side of the polarizer is coated with a PVA-based adhesive.
• the transparent protective film a was laminated and dried at 60 ° C for 5 minutes and at 70 ° C for 5 minutes to obtain a polarizing plate.
• lamination was performed while controlling the tension so that the obtained polarizing plate was flat.
• the obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.
• the polarizing plates of the examples of the present invention have excellent adhesiveness even under high temperature and high humidity, and show no light leakage, as compared with the polarizing plate of the comparative example. Understand. That is, after forming the first transparent protective film bonded to one surface of the polarizer a laminate having the following moisture permeability 200g / m 2 / 24h, the first to Nag that winding the laminate By bonding a second transparent protective film having a higher moisture permeability than the transparent protective film to the other surface of the polarizer, peeling and curling at the time of bonding are prevented, and the polarizer and the transparent protective film are bonded together. It is understood that a polarizing plate having excellent adhesiveness can be obtained. Further, as is apparent from a comparison between Example 1 and Comparative Example 4, a transparent protective film having relatively low moisture permeability is bonded after a transparent protective film having relatively low moisture permeability is bonded. It can be seen from FIG.
• the polarizing plate of the present invention can be suitably used for flat panel displays such as liquid crystal display devices and self-luminous display devices (for example, organic EL display devices).

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